Vivitar TX 35mm f2.8
My copy of this lens was made by Tokina. I used a Minolta TX mount to test this lens on my Eos M3.
This lens surprised me. I expected it to be sharp at f8 w/ lots of Chroma. I was wrong.
This old lens is sharp enough at f2.8 it is sharp 'corner to corner' up to f11. The whole frame tightens up nicely as you climb through the f-stops.
Fringing is barely noticeable at 100% crop. Barely noticeable.
I did not test flare yet but I might guess it's well controlled.
Colors are a little flat but accurate. Contrast is consistent thru the entire aperture range.
Bokeh is a tad rough above f2.8. At f4 and up highlights form hexagons and circles.
The focus throw on this lens is very, very long. It's a long tedious turn from 3 ft to infinity. It is difficult to focus handheld. Even on the M3 with the image magnified I was unsure of focus.
Focus is heavily dampened, too. It is smooth but slow. It is possible that my copy needs a regreasing.